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DOI | 10.1175/JCLI-D-17-0558.1 |
Charge in Long-Lasting El Nino Events by Convection-Induced Wind Anomalies over the Western Pacific in Boreal Spring | |
Li, Zhenning1; Yang, Song1,2,3; Hu, Xiaoming1,2; Dong, Wenjie1,4; He, Bian5 | |
2018-05-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:10页码:3755-3763 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | In this study, El Nino events are classified as long El Nino (LE) events and short El Nino (SE) events based on their durations, and the characteristics of the early stages of these events are investigated. Results indicate that LE events tend to start earlier compared to SE events, initiating in boreal spring and peaking in winter. Their early occurrence is attributed to the western equatorial Pacific (WEP) sea surface wind anomalies that benefit the eastward propagation of warm water by forcing the downwelling Kelvin waves. It is also found that the wind anomalies are potentially induced by the convection anomalies over the WEP in spring. Experiments with a fully coupled climate model forced by convection heating anomalies over the WEP show that El Nino events become stronger and longer after introducing anomalous convection heating. The convection anomalies induce an extensive anomalous westerly belt over the WEP, which charges El Nino by eastward-propagating Kelvin waves. Moreover, induced by the anomalously northward-shifted ITCZ heating and the suppressed heating over the Maritime Continent, the equatorially asymmetric westerly belt reduces the meridional shear of mean easterly wind in the lower latitudes, which maintains an anomalous equatorward Sverdrup transport and in turn prolongs the persistence of El Nino events. A case study of the 2015/16 super El Nino and a regression study by using a rainfall index in critical regions support the above results. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000430539700003 |
WOS关键词 | TROPICAL PACIFIC ; INDIAN-OCEAN ; ANNUAL CYCLE ; GLOBAL PRECIPITATION ; COLD-TONGUE ; ENSO ; MONSOON ; SYSTEM ; MODEL ; ONSET |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/19742 |
专题 | 气候变化 |
作者单位 | 1.Sun Yat Sen Univ, Sch Atmospher Sci, Guangzhou, Guangdong, Peoples R China; 2.Sun Yat Sen Univ, Guangdong Prov Key Lab Climate Change & Nat Disas, Guangzhou, Guangdong, Peoples R China; 3.Sun Yat Sen Univ, Inst Earth Climate & Environm Syst, Guangzhou, Guangdong, Peoples R China; 4.Sun Yat Sen Univ, Guangdong Hong Kong & Macao Joint Lab Trop Oceani, Guangzhou, Guangdong, Peoples R China; 5.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Li, Zhenning,Yang, Song,Hu, Xiaoming,et al. Charge in Long-Lasting El Nino Events by Convection-Induced Wind Anomalies over the Western Pacific in Boreal Spring[J]. JOURNAL OF CLIMATE,2018,31(10):3755-3763. |
APA | Li, Zhenning,Yang, Song,Hu, Xiaoming,Dong, Wenjie,&He, Bian.(2018).Charge in Long-Lasting El Nino Events by Convection-Induced Wind Anomalies over the Western Pacific in Boreal Spring.JOURNAL OF CLIMATE,31(10),3755-3763. |
MLA | Li, Zhenning,et al."Charge in Long-Lasting El Nino Events by Convection-Induced Wind Anomalies over the Western Pacific in Boreal Spring".JOURNAL OF CLIMATE 31.10(2018):3755-3763. |
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